Final answer:
USPAP mandates that an appraiser must perform assignments competently, which includes both technical proficiency and ethical conduct. Competence is crucial for public trust and legal validity in the appraisal profession, making it the correct answer to the question.
Step-by-step explanation:
USPAP requires an appraiser to perform competently when completing an assignment. USPAP, which stands for the Uniform Standards of Professional Appraisal Practice, sets guidelines to ensure that appraisals are performed with a high level of expertise and adherence to professional standards. This includes not just the technical competence in valuation methods, but also ethical conduct, such as avoiding conflicts of interest and preserving confidentiality.
When appraisers work competently, they apply their knowledge, skills, experience, and education to effectively perform their appraisal duties. It's essential for maintaining public trust in the appraisal process and for the legal defensibility of their work. Therefore, the option (C) Competently is the correct answer to what USPAP requires from an appraiser.